Dear Dr. Donohue: I am a 32-year-old woman, married with two children. For this entire year, I have not been myself. I have had loose stools at least twice a day, and have lost 20 pounds without trying. Finally, my husband insisted I see a doctor. I did, and that doctor sent me to a gastroenterologist, who diagnosed celiac disease. No one in my family has had it, and no one has heard of it. I ...